Please don't abandon your shoe

I am puzzled about the shoes left along highways, byways, roadways and yes, parking lots. They're never in pairs. Who abandons one but not both of a pair of shoes?  And who would abandon a shoe at all, unless it's to a good cause such as a resale shop?

Size 7 flipflop with stretchy heel strap. Nothing wrong with it to speak of, other than it's a little worn out. Perhaps it just fell out of a patron's car when she went into Chick-Fil-A?

Shoe of unknown size, evidently worn out and thrown aside for a newer model. Shame on you!

Size 9 sandal from Target that lasted 10 years, then finally snapped. It was perfectly in style in a classic sort of way before it went bye-bye.